Luminous projection apparatus



June 24, 1930. y M L BRANGER 1,768,111 l LUIIINOUS PROJECTION APPARATUS Filed vec. 23. 1927 2 sheets-sheet i June 24, 1930. M. l.. BRANGER LUMINOUS PROJECTION APPARATUS 2 Sheets-Sheet 2 Filed Dec. 23'. 1927 Patented June 24, 1930 MARICE LOUIS BRANGER, OF PARIS, FRANCE LUMINoUs rRoJncrIcN APPARATUS Application filed December 23, 1927, Serial No. 242,234, and in France March 2S, 1927.

There are already known types of luminous projection apparatus (lanterns) suitable for all purposes, such as education, publicity, attractions, et cetera, comprising in combina- 5tion with the so-called lfixedsystem of projection, a rotary magazine having a vertical axis of rotation in which are placed the slides to be projected, the latter being automatically and in succession advanced into the required position for projection by being pushed in a direction perpendicular to the axis of rotation of the magazine in certain cases, and by being pushed in a direction parallel to the axis of rotation in other cases.

It is recognized that apparatus of this design have numerous drawbacks as a result of the principle of their construction and that their functioning is uncertain.

In the known forms of these apparatuses y the slides are led to the required position for projection too slowly, and there is no obstruction of the light during the displacement of the slides. Moreover, the frames which are always constituted by several side members,

involve diiiculties to the access of the slides and prevent the detachability of the majority of the component elements and particularly of the magazine which it may be desirable to replace, as for instance, when a lantern lecture includes more slides than` can be contained in this magazine.

With the object of avoiding the above drawbacks, this invention is a luminous pro? jection apparatus of automatic or' controlled function which permits of the light from the lantern being obstructed between the time of leaving of one slide and the arrival of the next slide, which time is of short duration. The apparatus is constituted by a single 10 frame with a vertical side member on which are fitted the lantern, the condenser and the objective. Also on this side member are disposed certain bosses, one for each spindle of each of the moving members, which have a rotary or oscillating motion. This is for the purpose of rendering all the members perfectly accessible both for fitting and for adjustment. It further serves the purpose of making the magazine detachable as well as 5@ all the other component parts, as all the spindles or pivots have only a single bearing or housing, and furthermore itV serves to produce an apparatus with a minimum number of constituent parts.

As the magazine is specially visible, the slide compartments can be numbered and the return to zero effected rapidly owing tothe extreme accessibility of the pawl.

An embodiment of the manner in which this invention can be carried out is hereafter described with reference to the annexed drawing whereon similar numerals of reference denote corresponding parts throughout the several views.

Fig. l is a front elevation of the vwhole of the mechanism.

Fig..2 isan end elevation of the whole of the mechanism.

These figures illustrate an apparatus wherein the weight of the slide is utilized in such a manner that it comes of itself into the correct position for projection. The circular magazine 1 has for this purpose its axis of rotation disposed horizontally so that it revolves above a concentric member 2 which serves to retain the slides placed below the horizontal so that they cannot be ejected from the magazine. On the extended vertical diameter of the magazine is a slit 3 which when opened enables the slide which is to be projected to pass therethrough.

The slide then takes up its position of rest, being controlled by the'shutter 4f movable vertically in a guideway in a slide rail 5 and subject to the effect of the thrust' given to it by an oscillating lever 6 which is set into operation at the required moment by a suitable form of cam 7 At the precise moment when the slide is at the high point in kthe course of its return to its housing, the magazine then receives a rotary movement sufficient to permit of the projection either of the next following slide orY of the second or third following slide.

This rotary movement of the magazine is obtained through the pawl 8 which co-acts with one of the circular walls 9 of the magazine, which walls are suitably provided with a toothed rack for this purpose, the pawl yin question being fitted to one of the extremities of a lever 10, the-other extremity being suitabl 11 iivhich causes the lever to turn either on its centre 12 or at a point 12 a fraction of its length, for the delivery of one slide after another or of alternate or every third slide.

Other pivotal bearings for the lever can be provided for different fractions than those indicated in thek drawing if required.

The two cams 7 and 11 are integral with a spindle 13 which is operated by a worm or helical gear 14 which can be controlled by an electric motor 15, or can be set in motion by hand, either in proximity or at a distance.

The closing of the slit 3, to permit of the rotation of the magazine withoutv allowing the slide to fall into the slide rail 5, is ensured either by raising the shutterv 4 or by a bolt suitably housed at 3.

To fixcthe magazine- 1 in a position suitable' for the fall of a slide a spring-pressed plunger 16 is disposed in the side member, said plunger engaging` in the holes 17 suit- .f ably formed in the wall 8 of the magazine.

The inner end of the spring-pressed plunger or pin 16 is slightly rounded (see dotted lines, Fig. 2)y so that when the magazine is given a forward movement said pin will be forced outward from the hole 17 in which it may be located and will spring. into thenext hole vinthe magazine when said ynext hole arrives in position to register with said plunger,V or pin. Y l

'llhejbackwardl movement of the levers 6 and 10are limited by the abutments 6 and 10 respectively,these levers being returned to their position by springs.

For placing, the magazine intoposition ,andV for its'removal, it should be encased in a cylinder which serves for its conveyance. For this Vpurpose the sidemember has pro-V jecting from its head a screw-threaded pin 18 which receives the nut 19 to enable the `placing in position of the simplified magazine to be used. 20 is the objective, 21 the condenser and4 22 the lamp. l

The concentric mem er 2 of the slide rail 5 may be integral with the frame.

The shutter 4 for raising the slide has a pivot 4. This arrangement is not necessary but canbe modified by having an opening in which the extremity of the lever 6 can move. This extremity of the lever would then be and would not require a pivot.

From the foregoing it will be understood that when'. a slide in t-he circular rotary magazine 1 isbroughtinto register with the slide-receiving guideway in the slide rail 5 such: slide will fall by gravity into said guideway when the shutterr 4 is in the lowered'positionshown in Fig. 1. At such time the slide will beinterposedbetween the obiective 20 andthe condenser 21. After exposure of the slide the lever Grwill be formed to transmit the action of a camv lifted to return the slide to cause the shutter 4 to return the slide to the magazine, and in its liftedposition the shutter will be interposed between the members of the project- Y modified' and may give place to a lens or pair oflenses for looking at views, as in the case or"y stereoscopes at present in existence.

1n these apparatuses it can easily be understood that the rotation of the magazine can take place automatically by the slide raising mechanism.V v

Having now described my invention, what 1 claim and desire to secure by Letters Patent is c 1. In a luminous projection apparatus, the combination with ak circular slide-carrying rotary magazine having radial guide grooves for the slides and means for'intermittingly rotating the Said magazine, of project-ion devices andv aslide-receiving guideway arranged below said magazine, said projecting devices including a lamp, a shutter disposed in said guideway and serving to lift the slides, and means for lifting said shutter afterV a slide, resting on said shutter, has been exposed, said shutter, when lifted, being interposed between the members of the projectingY device, so as to shut off the light from said.- lamp, and said shutter, when liftedre turning the exposedI slide to said magazine.

2. A luminous apparatus according tok claim 1 in l which the magazine rotating means comprises a lever and a cam for operating the same, and inwhich apparatus the shutter lifting means also comprises a lever and an operating cam therefor.

3. .A luminous projectingv apparatus according to claim 1 in which the magazine rotating means comprises a lever and means for varying the pivotal point of said lever to vary the rotaryy displacement of said magazine so as t-o bring any desired slide guide groove into register with the slidereceiving guideway below said magazine.

V4. A luminous projecting apparatus according to claim 1 which comprises a magazine having a series of holes and a springpressed plunger orpin arranged to enter said holes and by means of which plunger or pin the magazine may be held against displacement.

1n testimony whereof I .al-hx my signature.

MAURICE LOUIS BRANGER. 

